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arXiv 1509.08052cond-mat.mtrl-scicond-mat.str-el
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动力学阻滞后的交换偏倚

Exchange Bias following Kinetic Arrest

Praveen Chaddah

摘要:

当反铁磁相和铁磁相共存时,经常观察到交换偏置。两个相互竞争的磁性相的共存可以持续到最低温度,如果无序加宽的第一阶过渡分离它们被中断,提出的动力学逮捕现象。在这种现象中,可以通过遵循不同的冷却方案来调节共存相的分数。我们讨论了预测行为的交换偏置动力学逮捕现象。当循环磁场Hmax和测量温度T0取适当值时,零场冷却下不存在交换偏置,而随着冷却磁场的增大,交换偏置逐渐显现,并趋于饱和。

英文摘要:

Exchange bias is often observed when anti-ferromagnetic and ferromagnetic phases coexist. The coexistence of two competing magnetic phases can persist to the lowest temperatures if the disorder-broadened 1st order transition separating them is interrupted, as is proposed in the kinetic arrest phenomenon. The fractions of coexisting phases can, in this phenomenon, be tuned by following different cooling protocols. We discuss predicted behaviours of exchange bias resulting from the kinetic arrest phenomenon. Specifically, for appropriate values of cycling field Hmax and measuring temperature T0 there will be no exchange bias under cooling in zero field, while it will manifest with increasing cooling field, and then saturate.

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